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Seabird mortality caused by long-line fisheries can be greatly reduced by techniques such as setting long-line bait at night, dying the bait blue, setting the bait underwater, increasing the amount of weight on lines and by using bird scarers, [104] and their deployment is increasingly required by many national fishing fleets.
Climate change may well affect populations of seabirds in the northern Atlantic. The most important demographic may be an increase in the sea surface temperature, which may have benefits for some northerly Atlantic puffin colonies. [58] Breeding success depends on ample supplies of food at the time of maximum demand, as the chick grows.
They nest in burrows and often give eerie contact calls on their night-time visits. They lay a single white egg. They lay a single white egg. The chicks of some species, notably short-tailed and sooty shearwaters, are subject to harvesting from their nest burrows for food, a practice known as muttonbirding , in Australia and New Zealand.
A flock of barnacle geese during autumn migration Examples of long-distance bird migration routes. Bird migration is a seasonal movement of birds between breeding and wintering grounds that occurs twice a year.
The Swiss naturalist Conrad Gessner gave the northern gannet the name Anser bassanus or scoticus in the 16th century, and noted that the Scots called it a solendguse. [4] The former name was also used by the English naturalist Francis Willughby in the 17th century; the species was known to him from a colony in the Firth of Forth and from a stray bird that was found near Coleshill, Warwickshire.
Now those chicks are exposed to inclement weather events twice as often as they were in the 1970s, because despite the overall warming trend, late cold blasts of air still arrive around the same ...
Within these colonies, they most often nest in groups of 10 to 30 (or rarely 100) individuals. [46] Breeding can occur at any time of year, often prompted by commencement of the dry season or plentiful food. [44] Frigatebirds have the most elaborate mating displays of all seabirds.
A few species nest in small or dispersed groups, but most breed in colonies of up to a few hundred pairs, often alongside other seabirds such as gulls or skimmers. [5] Large tern species tend to form larger colonies, [18] which in the case of the sooty tern can contain up to two million pairs. Large species nest very close together and sit ...